What happens if you and your friends are having a good time taking on an enemy base, and fighting the boss, but then some other players who are a higher level than you, just come along, blitz through all the enemies, then leave?
Would there be a way to set it to private and limit it to just your friends while you're there?
It would really suck if it happened.
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I'd imagine that this would be taken care of through some sort of phasing system. Essentially, it encloses you and/or your group from other players, making sure you go into a fight uninterrupted. That's just my theory, though.